Highly efficient and green synthesis of 2,4-diphenyl substituted thiazoles

2,4-Diphenyl thiazole is an important organic intermediate and its derivatives contain multiple biological properties. In the present study, we reported a new protocol to synthesize 2,4-diphenyl thiazole analogs, which involved the bromination of ethyl benzoylacetates with NBS in the presence of 2-hydroxypropyl-β-cyclodextrin, followed by a direct cyclization with thiobenzamides in water. Compared with the reported method, the current protocol contains less reaction steps, milder reaction conditions, and simpler workup procedure.